Dorfman–Hellers 1990 — Calculate Before Recapturing
Objective: Black to move. Find the material-winning combination and maintain a -3.5 advantage for 3 moves.
Position and task condition
White has active heavy pieces, but the king is not completely safe. Black's knight can start a sequence of exchanges in which a single check makes all the difference. Calculate what actually remains on the board after three moves.
FEN
7k/1pp1qbpp/5p2/1Pn5/3pPP2/r1rP2P1/3Q1R1P/1RN2B1K b - - 0 1Josif Dorfman – Ferdinand Hellers · 1990 · Amsterdam, 1990